Is this a bug report?

Yes. I guess. More like an improvement.

Have you read the Contributing Guidelines?

Yes

Environment

$ react-native info
  Unrecognized command 'info'

Steps to Reproduce

1. Edit Debug server host & port for device.

2. Enter in a value that includes http://.

3. When trying to connect to the React Native packager, it will try http://http://....

Expected Behavior

I would expect that it to smartly not add http:// to an address that already contains http://.

Actual Behavior

It adds http:// to the address, thus duplicating it to http://http://

Reproducible Demo

Not necessary. Just launch the dev menu and see for yourself.

My Notes

When adding the IP address and port number for the React Native packager, the "http://" is automatically added. So, when people add "http://127.0.0.1:8081" in here, it tried to find the React Native package server at "http://http://127.0.0.1:8081".

I accidentally do this all the time and I'm sure others, especially newcomers, do as well.

I'm happy to issue a PR to make this more friendly but wanted to get your opinion on the direction.

1. Add a prefix to the EditText that shows "http://" so that it hints to the developer that there is no need to enter in the "http://" part.

2. When accepting the value, if the string starts with "http://" remove it.

3. When using the value, if the string starts with "http://" don't add it.

I'm leaning towards 3.

Let me know what you think and I'll take a look.

Thanks.

Josh